DS28EA00(3) One-Wire File System DS28EA00(3)NAMEDS28EA00 - 1-Wire Digital Thermometer with Sequence Detect and PIO
SYNOPSIS
Thermometer, PIO and Chain.
42 [.]XXXXXXXXXXXX[XX][/[ die | power | temphigh | templow |
PIO.A|B|ALL.BYTE | latch.A|B|ALL.BYTE | sensed.A|B|ALL.BYTE
]]
FAMILY CODE
42
SPECIAL PROPERTIES
power
read-only,yes-no
Is the chip powered externally (=1) or from the parasitically from the
data bus (=0)?
TEMPERATURE PROPERTIES
temperature
read-only, floating point
Measured temperature with 12 bit resolution.
temperature9 temperature10 temperature11 temperature12
read-only, floating point Measured temperature at 9 to 12 bit resolu‐
tion. There is a tradeoff of time versus accuracy in the temperature
measurement.
fasttemp
read-only, floating point
Equivalent to temperature9
PIO PROPERTIES
PIO.A|B|ALL|BYTE
read-write, yes-no
Two channels of sensors/switches. We use the logical raqther than elet‐
rical interpretation: 0=off (non-conducting) 1=on (conducting -- to
ground)
The PIO channels are alternatively used for the sequence-detect (chain)
mode.
Reading sensed gives the inverse value of the cooresponding PIO.
Reading PIO gives the actual pin values. Use the latch property to see
how the pin is set.
latch.A|B|ALL|BYTE
read-only, yes-no
Set (intended) va;ue of the PIO pins.
sensed.A|B|ALL|BYTE
read-only, yes-no
Actual logical level at the PIO pins.
SPECIAL PROPERTIES
power
read-only,yes-no
Is the chip powered externally (=1) or from the parasitically from the
data bus (=0)?
STANDARD PROPERTIESDESCRIPTIONDS28EA00
The DS28EA00 (3) is one of several available 1-wire temperature sen‐
sors. It is the replacement for the DS18S20 (3) Alternatives are DS1822
(3) as well as temperature/vlotage measurements in the DS2436 (3) and
DS2438 (3). For truly versatile temperature measurements, see the pro‐
tean DS1921 (3) Thermachron (3).
The DS28EA00 has special switch/sequence detect properties. In sequence
mode, the PIO pins are daisy-chained to the next DS28EA00, allowing the
system to step through the physical sequence of the DS28EA00s.
ADDRESSINGDATASHEET
http://pdfserv.maxim-ic.com/en/ds/DS28EA00.pdf
SEE ALSOAVAILABILITY
http://www.owfs.org
AUTHOR
Paul Alfille (paul.alfille@gmail.com)
OWFS Manpage 2003 DS28EA00(3)